migration: add on_delete: :delete_all to hashtags object_id fk

priv/repo/migrations/20210420204354_delete_hashtags_objects_cascade.exs

@@ -0,0 +1,19 @@
+defmodule Pleroma.Repo.Migrations.DeleteHashtagsObjectsCascade do
+  use Ecto.Migration
+
+  def up do
+    execute("ALTER TABLE hashtags_objects DROP CONSTRAINT hashtags_objects_object_id_fkey")
+
+    alter table(:hashtags_objects) do
+      modify(:object_id, references(:objects, on_delete: :delete_all))
+    end
+  end
+
+  def down do
+    execute("ALTER TABLE hashtags_objects DROP CONSTRAINT hashtags_objects_object_id_fkey")
+
+    alter table(:hashtags_objects) do
+      modify(:object_id, references(:objects, on_delete: :nothing))
+    end
+  end
+end